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<head>
    <meta charset="UTF-8">
    <title>HTML5 </title>
    <style>
        article,
        aside,
        figure,
        figcaption,
        footer,
        header,
        hgroup,
        nav,
        section,
        summary {
            display: block;
        }

        * {
            margin: 0px;
            padding: 0px;
        }

        body {
            font-size: medium;
            font-family: "Helvetica", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
        }

        a {
            color: #999;
            text-decoration: none;
            cursor: pointer
        }

        a:hover {
            color: #5188a6;
            text-decoration: none
        }

        #wrapper {
            max-width: 100%;
            min-width: 100%;
        }

        header.SiteHeader {
            padding: 10px;
            background: #000000;
        }

        aside.NavSidebar {
            padding: 5px 15px 5px 15px;
            width: 15%;
            background-color: #f9f9f9;
            font-size: small;
            float: left;
        }

        aside.NavSidebar h2 {
            color: #6B6E3F;
            border-bottom: thin #6B6E3F solid;
            margin-bottom: 10px;
            margin-top: 20px;
        }

        aside.NavSidebar ul {
            padding-left: 15px;
        }

        aside.NavSidebar li {
            padding-bottom: 8px;
        }

        aside.NavSidebar img {
            margin-top: 20px;
            border: white solid 4px;
        }

        .Content {
            padding: 20px;
            margin-left: 233px;
        }

        .Content .LeadIn {
            font-weight: bold;
            font-size: large;
            font-variant: small-caps;
        }

        .Content h3 {
            color: #24486C;
            margin-bottom: 2px;
            font-size: medium;
        }

        .Content p {
            margin-top: 0px;
        }

        header.ArticleHeader {
            padding: 10px;
            margin: 10px;
            text-align: center;
        }

        header.ArticleHeader h2 {
            font-size: xx-large;
        }

        header.ArticleHeader h3 {
            margin-top: 8px;
            font-weight: bold;
        }

        header.ArticleHeader .Byline {
            margin-top: 8px;
            font-style: italic;
            font-size: small;
        }

        footer {
            background: #333333;
            color: #c0c0c0;
            padding: 10px;
            text-align: center;
            font-size: x-small;
            clear: both;
        }

        footer .Disclaimer {
            font-style: italic;
        }

        footer p {
            margin: 3px;
        }
    </style>
</head>

<body>
    <div id="wrapper">
        <header class="SiteHeader">
            <h1>一号标题头</h1>
        </header>

        <aside class="NavSidebar">
            <nav>
                <h2>2号标题</h2>
                <ul>
                    <li>
                        <a href="...">Swift - 委托（delegate）的介绍，及使用样例</a>
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                    <li>
                        <a href="...">Swift - 让程序挂起后，能在后台继续运行任务</a>
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                        <a href="...">Swift - 产生不重复数字的随机数生成器</a>
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            <section>
                <h2>关于我们</h2>
                <p>这个是一个简短的介绍。这个是一个简短的介绍。这个是一个简短的介绍。这个是一个简短的介绍。
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        <main>
            <article class="Content">
                <header class="ArticleHeader">
                    <h2>欢迎来到11111111111111</h2>
                    <h3>3号标题，3号标题，3号标题，3号标题</h3>
                    <p class="Byline">by XXX.XXX</p>
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                <p>前面讲了如何让程序申请后台短时运行。但这个额外延长的时间毕竟有限。</p>
                <br/>
                <h3>小标题1</h3>
                <p>前面讲了如何让程序申请后台短时运行。但这个额外延长的时间毕竟有限。</p>
                <br/>
                <h3>小标题2</h3>
                <p>前面讲了如何让程序申请后台短时运行。但这个额外延长的时间毕竟有限。</p>
            </article>
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